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Reinsurance (Tables)
 3 Months Ended
Mar. 31, 2018
Reinsurance Disclosures [Abstract]  
Schedule of reductions to premiums and contract charges due to reinsurance premium ceded amounts
Effects of reinsurance ceded on property and casualty premiums earned and life premiums and contract charges

($ in millions)
 
Three months ended March 31,
 
2018
 
2017
Property and casualty insurance premiums earned
 
$
(239
)
 
$
(246
)
Life premiums and contract charges
 
(72
)
 
(75
)
Schedule of reductions to costs and expenses due to reinsurance ceded amounts
Effects of reinsurance ceded on property and casualty insurance claims and claims expense, life contract benefits and interest credited to contractholder funds
($ in millions)
 
Three months ended March 31,
 
2018
 
2017
Property and casualty insurance claims and claims expense
 
$
(187
)
 
$
(131
)
Life contract benefits
 
(49
)
 
(47
)
Interest credited to contractholder funds
 
(4
)
 
(5
)